Shut down your computer, and then remove all the Peripheral
Component Interconnect (PCI) devices.Restart your computer.If Windows starts successfully, shut down your
computer, and then reinstall the PCI devices one at a time. Start
Windows
after the installation of each device. When you install a device
that causes
the issue that is described in the "Symptoms" section, remove that
device, and then continue to install the other PCI
devices.

If Windows does not start successfully, remove
one or
more of the memory modules(RAM) that are installed in your computer.
Leave sufficient
RAM for your computer to start and run Windows XP.

1 Suggested Answer

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This is a typical sign of a defective hard drive.Your hard drive might or might not be repairable, depending on the degree of damage.I would recommend that you use a live CD (such as this one: http://www.ultimatebootcd.com/download.html) to boot up your computer & run a hard disk diagnostic tool like HDD Regenerator. It might take several hours (sometimes days) to fix the damage. If this did not help, then you will have to replace the hard drive.

You have two ways to solve the problem of "Pci.sys Is Missing or Corrupt" Error Message When You Start Windows.

1.Booting with WinXP CD to access the Recovery Console’s Repair option, and then copy from WinXP CD the missing or damaged Pci.sys file to Systemdrive:\Windows\System32\drivers folder , Exit and Reboot.